Re: [Phys-l] force or mass

["Richard Tarara" <rbtarara@sprynet.com>]

> From the referenced site:

In some contexts, the term "pound" is used almost exclusively to refer to
the unit of force and not the unit of mass. In those applications, the
preferred unit of mass is the slug, i.e. lbf·s²/ft. In other contexts, the
unit "pound" refers to a unit of mass. In circumstances where there may
otherwise be ambiguity, the symbols "lbf" and "lbm" and the terms
"pounds-force" and "pounds-mass" can be used to distinguish.

So may I suggest that Bernard read the whole article!  ;-)

Rick


----- Original Message ----- 
From: "Bernard Cleyet" <bernardcleyet@redshift.com>
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
Sent: Wednesday, November 05, 2008 3:47 PM
Subject: Re: [Phys-l] STUDY SUGGESTS NO CHILD LAW MAY BE DUMBING
DOWNSTUDENTS


> "The pound-force is approximately equal to the gravitational force
> exerted on a mass of one avoirdupois pound on the surface of Earth."
>
> From your reference.
>
>
>
> And my reference:
>
>
>
> "This article is about the unit of mass. For the unit of force, see
> Pound-force.
> The pound or pound-mass (abbreviation: lb, lbm, or sometimes in the
> United States: #) is a unit of mass used in the imperial, United
> States customary and other systems of measurement."
>
>
>
> bc suggests Robert read more carefully, and is reminded of Einstein's
> dictum: change the facts to fit the theory.
>
> On 2008, Nov 04, , at 23:56, Robert Yeend wrote:
>
> > Well, Wiki also disagrees with you
> >
> > http://en.wikipedia.org/wiki/Pound-force
> >
> > Bob
> >
> > On Nov 4, 2008, at 10:43 PM, Bernard Cleyet wrote:
> >
> > > I, too, went thru life (about > 50 years) thinking the pound was a
> > > unit of force.  It is not, as pointed out by JD recently.
> > >
> > > https://carnot.physics.buffalo.edu/archives/1999/10_1999/
> > > msg00645.html
> > >
> > > "For what it's worth" Wiki. agrees w/ me also:
> > >
> > > http://en.wikipedia.org/wiki/Pound-mass
> > >
> > > bc, disabused.
> > >
> > >
> > >
> > > On 2008, Nov 04, , at 10:25, Rick Tarara wrote:
> > >
> > > >  The technically
> > > > incorrect 2.2 lbs = 1 kg (formally the weight of 1 kg is 2.2 lbs)
> > > > works
> > > > fine.
> > >
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